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Process for the production of curve glazing with a high transmittance in the visible spectral range and a high reflectance for thermal radiation

  • US 4,919,778 A
  • Filed: 05/19/1989
  • Issued: 04/24/1990
  • Est. Priority Date: 12/06/1985
  • Status: Expired due to Fees
First Claim
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1. Process for the production of curved glazing with a high transmittance in the visible range and a high reflectance for thermal radiation, comprising the following steps:

  • (a) coating a mineral glass substrate with a first layer of at least one oxide selected from the group consisting of stannic oxide, silicon dioxide, aluminum oxide, tantalum oxide, and zirconium oxide,(b) coating the first layer with a second layer of at least one metal selected from the group consisting of tantalum, tungsten, nickel, and iron or alloys with at least fifty percent by weight of one of these metals, the thickness of this layer being selected to have a lower transmittance of visible light than desired in the finished glazing,(c) coating the second layer with a third layer selected from the group consisting of silver and a silver alloy with at least fifty percent silver by weight,(d) coating the third layer with a fourth layer of a metal selected from the group forming the second layer, the thickness of said fourth layer being selected to have a lower transmittance of visible light than desired in the finished glazing,(e) coating the fourth layer with a fifth layer of at least one oxide selected from the group forming the first layer,(f) heating the coated substrate in an oxidizing atmosphere at least to the softening temperature of the glass until the second and fourth layers are oxidized sufficiently to increase the average transmittance by at least 5 percent,(g) bending the substrate during said heating in said oxidizing atmosphere.

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